<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <el-alert
        title="添加商品信息"
        center
        show-icon
        :closable="false"
        type="info"></el-alert>
        <!-- 步骤条区域 -->
        <el-steps :active="active * 1" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="基本参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>
        <!-- tab栏区域 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
          <!-- 步骤条的v-model绑定的是name的值 -->
          <el-tabs
              v-model="active"
              :tab-position="'left'"
              :before-leave="beforeTabLeave"
              @tab-click="tabClick">
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  :props="cateProps"
                  @change="handleChange"></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="基本参数" name="1">
              <!-- 参数面板 -->
              <el-form-item
                v-for="item in manyTable"
                :key="item.cate_id"
                :label="item.attr_name">
                <!-- checkbox组 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="i" v-for="(i, index) in item.attr_vals" :key="index" border></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item
                :label="item.attr_name"
                v-for="item in onlyTable"
                :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!-- action 表示图片上传的后台地址 -->
              <!-- list-type 图片的预览效果 -->
              <!-- 图片发送的不是axios请求，需要添加请求头 -->
              <el-upload
                :on-success="handleSuccess"
                action="http://123.57.160.83:8090/api/private/v1/upload"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj">
                <el-button size="small" type="primary">点击上传</el-button>
                <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器组件 -->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <el-button type="primary" size="mini" @click="add">添加商品</el-button>
            </el-tab-pane>
          </el-tabs>
        </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
      title="图片"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPsth">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      active: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 选中的级联商品数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      cateList: [],
      // 联机选择器选什么数值作为键
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        expandTrigger: 'hover'
      },
      // 参数面板的数据
      manyTable: [],
      // 属性面板的数据
      onlyTable: [],
      // 图片上传的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 临时预览路径
      previewPsth: '',
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取级联选择器的数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择器选中项发生变化
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // tab切换之前判断是否带有选项卡信息
    beforeTabLeave(activeName, oldName) {
      if (oldName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    // tab点击时触发事件
    async tabClick() {
      // 访问商品参数面板
      if (this.active === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'many'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败！')
        }
        this.$message.success('获取参数列表成功！')
        // console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTable = res.data
      } else if (this.active === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'only'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取属性列表失败！')
        }
        this.$message.success('获取属性列表成功！')
        this.onlyTable = res.data
        console.log(res.data)
      }
    },
    // 图片的预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPsth = 'http://123.57.160.83:8090/' + file.response.data.tmp_path
      this.previewVisible = true
    },
    // 移除图片的效果
    handleRemove(file) {
      // console.log(file)
      // 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 从pics数组中，找到这个图片的对应索引值
      const i = this.addForm.pics.findIndex(x => {
        return x.pic === filePath
      })
      // 调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess(success) {
      // console.log(success)
      // 拼接得到一个图片信息
      const picInfo = { pic: success.data.tmp_path }
      // 将信息对象，push到pics
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 富文本下方的添加按钮
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项！')
        // 因为次联选择器绑定的goods_cat必须是数组，此处如果直接将数组转为字符串，会报错
        // 这里使用深拷贝,拷贝一个addForm，form仅作为网络请求使用
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        // 处理静态属性
        this.manyTable.forEach(item => {
          console.log(item)
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTable.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        const { data: res } = await this.$http.post('goods', form)
        console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-cascader {
  width: 250px;
}
.el-checkbox {
  margin: 0 5px 0 0;
}
</style>
